Summarise what batsman might be before boundary (7)
I believe the answer is:
outline
'summarise' is the definition.
(thesaurus)
'what batsman might be before boundary' is the wordplay.
'what batsman might be' becomes 'out' (cricket term).
'before' says to put letters next to each other.
'boundary' becomes 'line' (**).
'out'+'line'='OUTLINE'
(Other definitions for outline that I've seen before include "Preliminary plan or summary of main points" , "Sketch or contour" , "Profile" , "route" , "Framework" .)